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427/428 "FE" FLAT TOP

Specially designed for the latest aftermarket blocks and heads, these pistons are for use with the aftermarket 4.250" crank and aftermarket 6.700" rods. The factory block should be sonic checked for 4.280" and 4.310" bores. These pistons use 1/16, 1/16, 3/16 rings. The compression ratios are figured for 10.150 block height. Larger bore sizes available as customs, call JE for details. Note: Does not work with OEM Connecting Rods. Designed for Aftermarket Connecting Rods only.

Includes:
Pin#990-2930-15-51S (150g)
Double spiro locks (#990-042-CS)
Note: Does not work with OEM Connecting Rods. Designed for Aftermarket Connecting Rods only.
427 FLAT TOP SERIES
Std Bore: 4.233
Ring package designed for: 1/16, 1/16, 3/16 Rings
Note: Does not work with OEM Connecting Rods. Designed for Aftermarket Connecting Rods only.

Tech and Installation Tips
Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
72cc 74cc 88cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
242933 482 4.250 4.250 6.700 10.150 1.325 12.3 12.1 10.6 -5.0 513 0.017 J100F8-4250-5
242934 489 4.280 4.250 6.700 10.150 1.325 12.5 12.3 10.8 -5.0 518 M 0.047 J100F8-4280-5
242935 496 4.310 4.250 6.700 10.150 1.325 12.7 12.5 11.0 -5.0 528 M 0.077 J100F8-4310-5

- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.


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